fix(thread): add warning when attachments are too big

rustmail/src/handlers/guild_messages_handler.rs

@@ -143,6 +143,26 @@ async fn manage_incoming_message(
 
             let channel_id = ChannelId::new(channel_id_num);
 
+            const MAX_ATTACHMENT_SIZE: u32 = 8 * 1024 * 1024;
+            for attachment in &msg.attachments {
+                if attachment.size > MAX_ATTACHMENT_SIZE {
+                    let _ = MessageBuilder::system_message(ctx, config)
+                        .translated_content(
+                            "discord.attachment_too_large",
+                            None,
+                            Some(msg.author.id),
+                            None,
+                        )
+                        .await
+                        .to_user(msg.author.id)
+                        .send(true)
+                        .await;
+
+                    drop(guard);
+                    return Ok(());
+                }
+            }
+
             if let Err(e) = send_to_thread(ctx, channel_id, msg, config, false).await {
                 let error = validation_failed(&format!("Failed to forward message: {}", e));
                 let _ = error_handler

rustmail/src/i18n/language/en.rs

@@ -43,6 +43,10 @@ pub fn load_english_messages(dict: &mut ErrorDictionary) {
         DictionaryMessage::new("Discord API error")
             .with_description("An error occurred while communicating with Discord"),
     );
+    dict.messages.insert(
+        "discord.attachment_too_large".to_string(),
+        DictionaryMessage::new("Your attachment is too large! Discord has a file size limit of 8 MB for attachments. Please reduce the file size or send a link."),
+    );
     dict.messages.insert(
         "discord.user_is_a_bot".to_string(),
         DictionaryMessage::new("The specified user is a rustmail."),

rustmail/src/i18n/language/fr.rs

@@ -41,6 +41,10 @@ pub fn load_french_messages(dict: &mut ErrorDictionary) {
         DictionaryMessage::new("Erreur de l'API Discord")
             .with_description("Une erreur s'est produite lors de la communication avec Discord"),
     );
+    dict.messages.insert(
+        "discord.attachment_too_large".to_string(),
+        DictionaryMessage::new("Votre pièce jointe est trop volumineuse ! Discord a une limite de taille de fichier de 8 Mo pour les pièces jointes. Veuillez réduire la taille du fichier ou envoyer un lien."),
+    );
     dict.messages.insert(
         "discord.user_is_a_bot".to_string(),
         DictionaryMessage::new("L'utilisateur spécifié est un rustmail"),

rustmail/src/modules/threads.rs

@@ -140,6 +140,25 @@ pub async fn create_channel(ctx: &Context, msg: &Message, config: &Config) {
         return;
     }
 
+    const MAX_ATTACHMENT_SIZE: u32 = 8 * 1024 * 1024;
+    for attachment in &msg.attachments {
+        if attachment.size > MAX_ATTACHMENT_SIZE {
+            let _ = MessageBuilder::system_message(ctx, config)
+                .translated_content(
+                    "discord.attachment_too_large",
+                    None,
+                    Some(msg.author.id),
+                    None,
+                )
+                .await
+                .to_user(msg.author.id)
+                .send(true)
+                .await;
+
+            return;
+        }
+    }
+
     let (target_channel_id, _is_new_thread) =
         match create_or_get_thread_for_user(ctx, config, msg.author.id).await {
             Ok(res) => res,